Bug#354458: Kernel panic after upgrading initramfs-tools
So, the problem I had is mostly solved, I can boot again, so there's no
huge problem anymore. The only problem is that the ide-disk module
isn't loaded automatically (anymore). This worked fine in the past, so,
something must be wrong.
Note that I installed initramfs-tools 0.55b and that I have a VIA 82CXXXX chipset.
If this is a bug in initramfs-tools, please send me an updated package
(which you actually also offered a few mails back), so I can test if it
solves this problem.